Its honestly not rare at all for it to happen. I know many athletes who have torn there ACL and got back out there and fully recovered but everyone is defiantly different. I went through physical therapy for a knee injury when I shouldn't have been in physical therapy because my knee was not answering well at all to it. Then again everyone is different and I wish op the best.
your acl is your anterior cruciate ligament it's in your knee. it keeps your tibia from moving anteriorly. you tear it by planting your foot and twisting your body inversely so the top part of your leg twists in. and it tears the acl